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Pension and Other Postretirement Benefit Plans - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 8 $ 8 $ 15 $ 17
Interest cost 14 16 28 31
Expected return on plan assets (20) (16) (40) (32)
Amortization of unrecognized prior service (credit) cost (11) (12) (21) (25)
Net loss (gain) amortization (12) (11) (24) (21)
Net periodic benefit cost (21) (15) (42) (30)
U.S. | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 86 76 173 152
Interest cost 134 133 269 266
Expected return on plan assets (207) (185) (417) (372)
Amortization of unrecognized prior service (credit) cost 0 0 0 (1)
Net loss (gain) amortization 10 0 20 0
Termination benefits 0 1 4 1
Curtailments 0 2 0 5
Settlements 0 5 0 26
Net periodic benefit cost 23 32 49 77
International | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 60 50 122 99
Interest cost 73 75 147 149
Expected return on plan assets (137) (130) (278) (257)
Amortization of unrecognized prior service (credit) cost (3) 16 (6) 12
Net loss (gain) amortization 1 (1) 3 (2)
Termination benefits 0 0 0 0
Curtailments 0 0 0 0
Settlements 0 0 0 0
Net periodic benefit cost $ (6) $ 10 $ (12) $ 1